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Radionuclide Dosimetric Data Sheets

Technetium-93m

Isotope:  Tc-93m
Atomic number (Z):  43
Mass number (A):  93
Neutron number (N):  50

Decay modes:  β+, Electron capture, Internal transition
Half-life:  43.5 [m]
Decay constant:  2.6557e-04 [1/s]
Daughters:  Tc-93 (76.6%), Mo-93 (23.4%)
Radioactive daughters:  Tc-93, Mo-93

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.10153 [MeV]
Mean photon energy:  0.95221 [MeV]
Air kerma rate constant, Γ₁₀:  3.250e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  3.361e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.627e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  1.627e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  1.526e-13 [Gy·kg/Bq·s]

Dose point kernel source:  Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.

Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.

Download tabulated dose point kernel file here:  www.mirdsoft.org/products/MIRDspecs/Tc-93m DPK.csv

Spectra source:  ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).

Download tabulated summary spectra file here:  www.mirdsoft.org/products/MIRDspecs/Tc-93m Summary Spectrum.csv

Spectra source:  ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).

Download tabulated beta spectra file here:  www.mirdsoft.org/products/MIRDspecs/Tc-93m Beta Spectrum.csv

 

Spectra source:  ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).

Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.

Download tabulated summary spectra file here:  www.mirdsoft.org/products/MIRDspecs/Tc-93m Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
6.84801e-06	2.070e+00	X-ray
7.87647e-06	1.802e+00	X-ray
1.73355e-02	3.936e-02	X-ray
1.74440e-02	7.500e-02	X-ray
1.82141e-02	3.607e-02	X-ray
1.83344e-02	6.858e-02	X-ray
1.95734e-02	1.190e-02	X-ray
2.05871e-02	1.104e-02	X-ray
3.91830e-01	5.791e-01	Gamma
5.11000e-01	5.733e-02	Annihilation photon
9.43700e-01	2.890e-02	Gamma
1.04680e+00	1.214e-02	Gamma
1.49220e+00	1.907e-02	Gamma
2.64460e+00	1.422e-01	Gamma
3.12900e+00	2.139e-02	Gamma
3.22030e+00	1.040e-02	Gamma
7.21337e-01	1.148e-02	Positron
1.17228e+00	1.531e-02	Positron
2.73600e-05	9.588e-01	Auger electron
2.93993e-05	7.877e-01	Auger electron
1.06556e-04	3.724e-02	Auger electron
1.06645e-04	1.824e-01	Auger electron
1.06881e-04	4.078e-02	Auger electron
1.10287e-04	1.643e-01	Auger electron
1.76249e-04	4.369e-01	Auger electron
2.03907e-04	3.987e-01	Auger electron
1.95198e-03	1.739e-01	Auger electron
2.05416e-03	1.571e-01	Auger electron
2.20131e-03	2.463e-02	Auger electron
2.33303e-03	2.448e-02	Auger electron
1.47064e-02	3.000e-02	Auger electron
1.54229e-02	2.498e-02	Auger electron
1.69714e-02	1.111e-02	Auger electron
3.70818e-01	1.599e-01	Conversion electron
3.88808e-01	2.072e-02	Conversion electron

 

Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:

National Nuclear Data Center (NNDC):  https://www.nndc.bnl.gov/nudat3/mird/

International Atomic Energy Agency (IAEA) Livechart:  https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html

ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107

Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789

MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6

 

 

 

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